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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b4825852c278c8d9bf846a5117480aa0aa7b3037b236750459d947f9e555a9' 
  AND token = 'hbb6qCldoXZt3R31eCB2S9L5SuFjaNxqZZZYvflY2Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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