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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c885c9c392f43127b13af0961e86ac4971a5b634eb59f21a33f1810ee8e665' 
  AND token = 'I0POKLTEvCH+IccA3LQOYghj85aE/9Qd+BDpD80gxXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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