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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbf80bdde2501a0df32aadff2a90d3bac64e797997c09f9c963754b441be08f' 
  AND token = '+3uevUly9Q9u39Xd8w1PGZpOXJq3MaucXwQca5Q+XPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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