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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ca6ae9c74cd3db04229366c31a0828ed7e0641cc1c0743c7172b47414449ac' 
  AND token = 'lKbQ+tbUFWeRghQJVwQEd/OlPZvjsKxU0vu4rREqs9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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