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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40a25676dabd015d8c5b42708b44e5395083ce389e851d50572c127e9c4f2fa' 
  AND token = 'eJExTVILTNqzCflGoFP8KWy9fHfKS1Zqa4N5p1KWtRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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