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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b83e46f9c9a77fdf7bedce985f72e94bb0d2f8a6ba3c9da6d631bbb8fae8bf' 
  AND token = '+WvqMavZLKK2HTLCc6a4FKH6oktvQP9nYq8MJX8F9ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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