SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8090952f4d58332ef6527bbd03b1f0dcba1f74f0678c7ff717698654ea0173a' 
  AND token = 'PNM+8jc+EY2wwuHoBF2y2xLbb74qRUU9njYhMs/l9Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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