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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85718c4347caa8f01de6ac2a4c0a0c598b59ec6a8f0e2896d42817a61bca5230' 
  AND token = 'aIFZM/5GGGDBhNvodSJa5xnP2khihh9bZoMXLYNosck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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