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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33aa33b2d04e1319bab3e491e2d1902615c848fe6cc47eaa20da5a5b89a21929' 
  AND token = '9uGhRSlLn8gG8QZ/QJmA4bhekJ3CuLIn9eErkIrkjjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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