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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2633779cb46ee5cf775bc2de95ef0b669348311016fa0eda93d5ab601397e3dc' 
  AND token = '7ThL01tPHQk8hfUtYv4ViPOnV8O4qHdiYFYFrmIxexg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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