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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8169602e5733a35745d13fc186768dbe1c4f16ee495f392b3d5ef1673b98fc27' 
  AND token = 'T47U7/snHOz5agtpE9S+SUr3V1xGaeDM55B9BTFlvUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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