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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab89846057024b92f825895e09439306643fe3ce5a2c6b917a0bc98a44d4bfd' 
  AND token = 'hf/Ww3fQl3LpGKAFM93NtLodKKaolMzcFMQtW8zHOB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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