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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ce6ed55d5c64ac1bcf74b49a2e989f0c4d9c13aff1c287ba85c75631f9e307' 
  AND token = 'hvaQ0clDdZktqJw28IbAriYZ+ptcocpZ6ERyMEMJbWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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