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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8debadc4f4b8edd875dbba70592950e08ba722b5c17889719c3aad3a51f68ede' 
  AND token = 'NNdq92xVE4x9rDUJf1AAZdKs1Syr5njT1yXAjj8XXOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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