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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d8e581b29cb3d97be6f585953db6aad0cb7c6f2e0899bea322790f428c7f57' 
  AND token = 'WVDwujyRzel0s4lKCBebmiOn2v4ODqr0TxWkUJpWGr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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