SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d95c640b14d19140bde81896f30174bef4ee0ee27c392a574036c507c2bfa83' 
  AND token = 'JNXvF4wvIKQ8xKL86Vn/sBsbGGvxheLoWMIzWasOgOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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