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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e234876e2bedbd7ba5b1cccd5b264df96501c27a312b1bb9f91e17d0797f80e4' 
  AND token = 'aUMeXlPsF3w4NRMdkgZ3UvKClu1feDtME62+uwjKj30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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