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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4a214248b826b898ab37de3196817d2c22e0b6bf4329cdd080f8d313a08908' 
  AND token = 'LAFiSfbA3T+WEarHmsuO/86AhhptdMxK3gVK5Lb+h5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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