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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f28020d741ad2270bd70cac20024816abe023e94dd8792d10e8a254ed36ef2' 
  AND token = 'D8luLlcl88zy2p+WfFSFyik/Nldvd0TUsBQafkkKHtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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