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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952204117a5bfeb03b36afddbc5b8f9e247748188392d9816c63b8574f529164' 
  AND token = 'cYdor7UwL0RFXQj7ebBdtIsKnX0LUZPR1H51n7y86KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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