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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019f558c70d9520cb6ee0e1eb147fff19549609987f7903db709a9685268119f' 
  AND token = 'fXs7qLIpwCaAf3jXHSj5xUG3P+QNU+kP7653CLF93YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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