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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7774ea7a5bd9a8dec655d741eeabe931f68859dadc9dfd6fab741c4bb0a5ee5' 
  AND token = 'eJTRCM4xnd+pxv1Ay3M5/uKCtTqxck80Ih0so8QIq4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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