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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b98e1114b51479024dbbe825599b37cac50d5988c9dff773fe0cbed960e6c5' 
  AND token = 'rD8XAgCmS20Pgb86FbvGpDzWQ4IY9k/139yi8bL8b2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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