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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27af0cb6785e2fcbab98227707a012e666ad0e448678ef7f4581247815c228fa' 
  AND token = 'IJJOy7Xpp7yYzIwQrdylVtGivGwDgtjGtqqpvAlB8k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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