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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec09d1ad35ec9e3b905aeb12561e8c499e2b5e589bc5544c32116086b3c388c' 
  AND token = 'i1wqvW9VsFCO1P2qP5rxpPJ4MfQENd2hUDCmXkOtn/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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