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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487bece65a18a3a92d537021bd254e70c80bfa0955ada694e9ed1fcc7bda105e' 
  AND token = '73nU/c8QUy5j8HGPgK6xynK72kbyvYfS2/+Zu4J2ZNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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