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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb6818faf43ace0a79d5ca530032ad6fb1c9eb3c22c93a20ad6cadcd52b0243' 
  AND token = 'naJUzp8/EVKeVMrEhEgxt3wHIzwR3fI+OkExE76Qrl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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