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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bf83b9eb24bfafe090ebc0cfd6c7699bbe2cb7d5cfebbae7de1eb4b3d9cc4e' 
  AND token = 'MAClKZV1Zc4Phc0mL2GjnbiX6zg/+vswX2C7pNeN4KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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