SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914c82f7b9e46e9503beff682bd07e21c39a15ba695b38eff04b771f1c4e4899' 
  AND token = '5Bzzr4jtNFWYR1ooW2wW4W+/T56l9pH9OZMVQJgPJMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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