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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1abe1c5372743eec7e94aadb8ed5c903845ad6f5ccf90497e49d7ed8ecccc1' 
  AND token = 'yhj0oZ0ogmlyuZM5W8d6i8mLTM+qR+medFZzmlKV/t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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