SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bba9369d0213b35c9286b4ab23c88dcf2b6648531334a4ea59c20a04645a9e' 
  AND token = 'LJwd6rWFVtB9SYpV6rtlKgj474zfwkOHJtHh/Euom0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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