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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c0b71605d73140e89cfa34a75f057c038a5b8aae8c8b91ee1a838763f6e065' 
  AND token = 'MqwQQ1uOmOA3E+epmld+xHsnMeoQFBLahNk/lKal4BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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