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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aacf276461e2911a4b93ea2ad9804f72d5b04f4e569abb6e76759a90c5bd5361' 
  AND token = '8W9sX9wXzr2cTrJESAgPlNYa06MuoJIQyO7eWQyF1F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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