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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505f372f8524f0daedee77c76cbd3390034f1dca96f0f3dd2ce70f325fa2dcea' 
  AND token = 'hV8X3va4gUxTjhtdQ4W2lWA7g2DiXm5zxN7M/M15J5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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