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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082f73995f3ce1db3c31539ec2d19d7d97c590eb952d73861897697913650e27' 
  AND token = 'gxp4Bl1jr42egS8hkCM2+QtOd8ZWLE8OQ4UkxlD5MXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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