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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f95ac341a130a0a16490bec8f74e1b47528b9344967a40b75e5c16832c0476a' 
  AND token = 'QXU2TdeA7+YvwbuUQN6ukJ5UOXj2AyNp/Mk9lMUDZYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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