SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d82509fea729dedb5554ee372a162aa3c008b493f01f86a9fd68c75395c7346' 
  AND token = 'foqpkUZLGeZRZOliJ4LaeGPgYKD2KqSBH0clTkz2H0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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