SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2bc5c7645f050cf75c7b2fdc79195cf6f7e3109b4a690b0cab1fc427462c2a' 
  AND token = 'XzGX/5VebTXbsDVqQBGQHgVFO9+WhuKZhnW/iKYA1Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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