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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebbbd6420e33169b00975ced52a044398f21e6c89e4235c59e2dd58d94fa22d' 
  AND token = 'krIrROZh3ZUSCQT4EybY2C/TbZapf5iy9yyG+zSWd9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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