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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63099ccfd9488f822db109574064d87d75729b01bbb18963a49157a8c02a671' 
  AND token = 'NcWBxys3004gjfRyK2Xd/ojaomDQpUHh8IMWTris3z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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