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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68014705b81f2c2e2591e13c6523ac9f930510f591fb1a22995c3f9389e37d3e' 
  AND token = 'xesf8mvluNj3/Bax/pKtrIOlq5PlFutw1iTadv82iqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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