SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcadc7bb74f78533593bf66e1c66c18182bdcfa986419244d465d05fe256c95' 
  AND token = '/fMvYWqr1YMSZlxvyNDLJQ6njQxakd+ES++kFB5m3Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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