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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a0090716b18c6998faf881d3472fad96d55a9d116fb8c0b89054b4204d5e01' 
  AND token = '6W4mT45K0Wl+IWtATujXoV2rH/bWowEB/08lbtGMOdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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