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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89da7cb403030f4e3c820c36f4e97a6c8fc37b44d80152001becb9b0699a6583' 
  AND token = 'Q/iwfew96u8uyoF6wTNGi5JqNElab4HTw/uExdyhOkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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