SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f0321c74570985b9c7346980249f88d786b095834fb96ab5cf0fe00997422' 
  AND token = 'Gf1RvRSMBwqah+INsTNwl2H2qDJ50xThY/kLXRRuOag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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