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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61fcde3165090e47110e89099e7699a4e3745e28817a4e31bae5993b92408bd' 
  AND token = 'yW0wqYIU1tSfuB6UnGMw9bGNCetEtx2U1o3PrUvW8rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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