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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128e7c541127b74d904652eb6a7e5d5157d4ddcc2d6219706d6ec0aafa9b78c9' 
  AND token = '5UjVNgEY9aHvAoybGfWkEFg/Ws514D9oD84h7JljtZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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