SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619d37db7e0e380234f751be6f7c8bee90ff245a0481137af6961abf98c781e0' 
  AND token = 'jsPE0ok28JWVUd/DurHZOJVXIYS3T5r+aVG/sFrluAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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