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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bba04a9feb3da62e819ff6afa6fb466c4834cb7508379b6ec0e23d598c04e02' 
  AND token = 'khmbK3Zyb4WkcJxnQO2JOVY5ObuZ738eB57JWt9dHzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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