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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1695b3cc0d98f44d0edae66b069d6fbd078c3dbb6da5bc61e4bf3acf88d0a20' 
  AND token = 'WVNULgkWXx2l2suMbtNcflZKGRrtlASVDKynTVWNdP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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