Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5dd9c6f0700f0523532bd5804850c993f53bc490efb9ee75c25492e32f1435' 
  AND token = '+7yM5Ld5w6rA7lsRydtowVwRwLTuUufZI+nQVag1bS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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