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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92359f71f55bc3bfb7de382988395d6de10bf40612a1fd8cc3b20bd42b9fc381' 
  AND token = 'MDryolX3Qa0ksgpBCVnwn6arm4C5ZNmJhy/G4ej2udo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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