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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab36ead94064ca670f1baf59cb1d98efa9dc076f6138b18422680c3671d53e6b' 
  AND token = 'GFJMnbk2LpNqqUkT76H+yD/ihMm7vLEXDsJE8drXRTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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