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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fa659fc7e572ab22400c6cecd4a79d7d280e5dbef3863cd97482ce68f65e70' 
  AND token = 'QTH3qamAJ4/FrsD4dFsszCTUzjzMX3ndmgdTl5/3Xmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}