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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30df263cc31760e77c61c4be4cf0427fc3c43daa6629a959ccb9755a3f6e2d2' 
  AND token = '0GHhjPQ4oQbDvHXQlo0PbVQNylvzFRr64JaoVAyJjvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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