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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3bcb8a599426cbf5536845dd9689dfaca1e0f74810c818da3b9a8d56d0a79a' 
  AND token = '29bTQVxndyKLcU0OjlvGlCfZoEPXldD/JKZcnu31xEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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