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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5302abd07a25ad0e43cce88cf1db02f31f08e3ef7540a271a001e09db26e925' 
  AND token = 'co8Tb126PLS5PM02boB9wKza6V3NCyljq46uCMJLSJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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