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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55edda8dedd37864dec4c632978614bcc10cc287916de16e1303f450a9a9ab5d' 
  AND token = 'xGKPW4howPbU6J5Z16aP90rb6+xwCv/yA9hwzC51moA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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