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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce2138a8b3663397059837c56363f93e42985c8cca92a2e68825f45eb3990b0' 
  AND token = 'SwCdHVg6RRiJM8zkBtx59H9TkBy3tFdwEdqgZQEt4+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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