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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c5025b07a462ee5e571af5378a6239a53ab3decb150f4e8c966c44cfb3d841' 
  AND token = 'IIJgRRgxBa6tNNs80oQ5X5q1u4/jyZQnVS7BE8p0lxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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