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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bc6ba36a44be8b58c12346e17e7f6c47c6eb220345bb3db4a4c4c02aa345c4' 
  AND token = '1qXXD4NyC1wLVqVM2p6AzMPlqWU1RwO4AECbMncwdLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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