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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1eb443a73886431513997c41090cf3bfc69db978b5ee2dc00b6b2341f248c4' 
  AND token = 'SwnfLpkPRZ/dvXhjIM/n/xc4Rwt4MqYArbkdW17YVw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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