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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64790cc4b3fdc2864e767b746016e0d2ceb8bca0193228a192c777b21b191d96' 
  AND token = '8SCUmKG8qq4e5C4P9Trq8/JiKFnjSICca2Gm/+nvqfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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